Fuel-supply pump.



No;.s74,385. Patented May 2L, 190|. L. H: NASH.

FUEL SUPPLY P'umP.

(Application led Feb. '8, 1897.)

l(No Model.)

N y a "#2 ll//l/ su 7 Tw: bams paens co4. PHorLmLlTNo.. WASHINGTON, c.c.

UNirEn STATES PATENT OFFICE.

LEWIS HALLOCK NASH, OF SOUTH NORWALK, CONNECTICUT, ASSIGNORTO THENATIONAL METER COMPANY, OF NEW YORK, N. Y.

FUEL-SUPPLY PUMP.

SPECIFICATION forming' part of Letters Patent No. 674,385, datedMay21,\1901.

Application led 'February 3, 1397. Serial No. 621,756. (No modeLl To allwhom, t may concern: v

Be it known that I, Lnws HALLocK NASH, a citizen of the United States,and a resident of South Norwalk, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements in `Fuel-Supply Pumps, of which the following is a specification. l

My invention relates to gas or'oil engines; io and it consists of animproved device for measuring and forcing the combustible liquid intothe passage leading to lthe'supplyport. l

In the accom panying drawings l have shown I5 my invention applied inthe form which is at present preferred by me; but it will be under-l'stood that various moditications'and changes may be madetherein withoutdeparting from the spirit of my invention and without exzo ceedingfthescope of the concluding claims.

' In the accompanying drawings, Figure 1 is a vertical section throughan oil-pu mp involving my invention, and Fig. 2 is a' vertical sectionat right angles to the section of Fig. 1.

z 5 The'following is a description of the structure illust-rated in thedrawings:

3 is an oil-supply pipe, and 4 is an overflow-pipe.

5 is a chamber or tank containing "liquid fuel-as, for example,gasolene.

6 is a submerged valveless cylindrical chamber open through passages 77, Fig. 2, to the oil contained in the chamber 5.

7 is a duct, open to the air, through which air enters to theinlet-port.

8 is a duct leading to the inlet-port.

The cylindrical chamber 6 is attached to a bearing 9 by means of webs 10l0. The bear-` ing 9 is held in place by screws 11 11. By removing thesescrews the bearing 9 and tube 6 can be removed from the casing.

12 is a plunger provided with a valveless longitudinal perforationl3,which plunger reciprocates in its bearings in the. part 9 6.

The operation of the device is as follows: When the plunger is in theposition shown in Fig. 2, liquid fuel enters the submerged chamber 6,through the passages 7l 7', by gravity. As the plunger 12 descends theoil 5o which is displaced from the submerged chamber 6 is forced throughthe perforation 13,

from which V'itescapesin the form of a jet andv is carried by thecurrent of air tothe combustion-cylinder. It will be seen, assuming theplunger 12 to have a determined stroke, 55

that the same amount of oil will be forced out through the perforation13 at each to-andfro motion of the plunger. This is due in part /to thefact that as the plunger is entering the subm'ergedcharnber it makes'asnb- 6o stantially tight joint therewith and leaves no other escape forthe oil contained therein than through the passage 13. It will also beevident that by increasing the throw of the y plunger, so that it entersthe chamber farther, anV increased amount of oil will be discharged fromthe pump at each to-and-fro motion thereof. Taking advantage of thisfactl preferably control the throw of the plunger 13 by a governordevice .15, which 7o may be ofany suitable construction. By. thiscontrivance I avoid in the supply-pump the use of auxiliary valves andpositively control the amount of fuel 'suppliedk to the engine at eachpower stroke.

lI have not illustrated nor described a gas or liquid-fuel engine inconnection with this feeding device, as it may be applied to anysuitable type of engine, either gas or liquidfuel; 'but it will beunderstood that the duct 8o r 8 leads to the inlet port or ports of thepowercylinder, where the combined air and fuel are utilized to furnishthe power for operating the same." It will be obvious that .the pasvsage 13, instead of beingmade in the plunger itself, may be cut inthestationary walls of the submerged chamber.

1. Afeed-pump for oil-engines and the like, comprising a reciprocatingplunger, a receiv- 9o ing-well and a cup submerged thereinv and adaptedto snugly receive the plunger end, said parts being provided with anunobstructed discharge-duct freely connecting the interior of the cupwith the engine. p

2. A feed-pump for oil-engines and thelike, comprising a plunger havinga bore or duct therein extending inward from its end and having a sidedischarge-opening which has unobstructed communication with the oil- 10ovaporizing chamber, a receiving-well and a cup submerged therein andadapted to snugly comprising a two-chambered casing,one cham` ber actingas a receiving-Well and the otherV as a discharge-chamber, means forsupplying the receiving-Well with oil, thepartition between saidchambers and the opposite Wall of the dischargingchamber having seatedopenings in line, a member having a plunger-receiving bore adapted to beinserted wit-hin said casing-openings, the inner end of said boreforming a cup which is submerged in the oil-receiving Well, and `aplunger mounted Within the `bore in said member and having a ductextending from its end and provided with a side discharge-opening in itsbody.

5. A feed-pump for oil-engines and the like, comprising a reciprocatingplunger, an oilreceiving Well and a cup submerged in said well andadapted to snugly receive the plunger end, said plunger being providedwith a discharge-duct connecting with the interior of the cup, combinedwith an automaticallyvariable plunger-reciprocating mechanism.

6. A feed-pump for oil-engines and the like, comprising a plunger havinga bore or duct therein extending inward from its end and having a sidedischarge-opening, a receiving- Well and a cup submerged therein andadapt; ed to snugly receive said plunger, combined with Aanautomatically-variable plunger-1e ciprocating mechanism.

7. In a pump the combination of a plunger having a freely-opendischarge-duct communicating With the plunger end, asupply-Well, a cupsubmerged in said Welland adapted to snugly receive the end of theplunger, and means for reciprocating the plunger into and out of saidcup.

LEWIS HALLOCK NASH.

Witnesses:

CHAs. RATHJIN, M. WILSON.

